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CdO-based nanostructures as novel CO_2 gas sensors

机译：基于CdO的纳米结构作为新型CO_2气体传感器

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摘要

Crystalline Cd(OH)_2/CdCO_3 nanowires, having lengths in the range from 0.3 up to several microns and 5-30nm in diameter, were synthesized by a microwave-assisted wet chemical route and used as a precursor to obtain CdO nanostructures after a suitable thermal treatment in air. The morphology and microstructure of the as-synthesized and annealed materials have been investigated by scanning electron microscopy, transmission electron microscopy, x-ray diffraction and thermogravimetry-differential scanning calorimetry. The change in morphology and electrical properties with temperature has revealed a wire-to-rod transformation along with a decreases of electrical resistance. Annealed samples were printed on a ceramic substrate with interdigitated contacts to fabricate resistive solid state sensors. Gas sensing properties were explored by monitoring CO_2in synthetic air in the concentration range 0.2-5v/v% (2000-50 000ppm). The effect of annealing temperature, working temperature and CO_2 concentration on sensing properties (sensitivity, response/recovery time and stability) were investigated. The results obtained demonstrate that CdO-based thick films have good potential as novel CO_2 sensors for practical applications.
机译：通过微波辅助湿化学法合成长度为0.3至几微米，直径为5-30nm的Cd（OH）_2 / CdCO_3晶体纳米线，并作为前体在适当的制备后获得CdO纳米结构。在空气中进行热处理。通过扫描电子显微镜，透射电子显微镜，x射线衍射和热重分析-差示扫描量热法研究了合成后退火材料的形貌和微观结构。形态和电学性质随温度的变化揭示了线对棒的转变以及电阻的降低。将退火后的样品印刷在具有叉指式触点的陶瓷基板上，以制造电阻式固态传感器。通过监测浓度范围为0.2-5v / v％（2000-50 000ppm）的合成空气中的CO_2，探索了气体传感特性。研究了退火温度，工作温度和CO_2浓度对传感性能（灵敏度，响应/恢复时间和稳定性）的影响。获得的结果表明，基于CdO的厚膜作为新型CO_2传感器在实际应用中具有良好的潜力。

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